Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/wordrec/lm_consistency.cpp @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: lm_consistency.cpp
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3 // Description: Struct for recording consistency of the paths representing
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4 // OCR hypotheses.
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5 // Author: Rika Antonova
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6 // Created: Mon Jun 20 11:26:43 PST 2012
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7 //
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8 // (C) Copyright 2012, Google Inc.
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9 // Licensed under the Apache License, Version 2.0 (the "License");
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10 // you may not use this file except in compliance with the License.
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11 // You may obtain a copy of the License at
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12 // http://www.apache.org/licenses/LICENSE-2.0
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13 // Unless required by applicable law or agreed to in writing, software
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14 // distributed under the License is distributed on an "AS IS" BASIS,
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15 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 // See the License for the specific language governing permissions and
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17 // limitations under the License.
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18 //
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19 ////////////////////////////////////////////////////////////////////////
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20
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21 #include "lm_consistency.h"
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23 #include "associate.h"
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24 #include "dict.h"
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25 #include "ratngs.h"
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27 namespace tesseract {
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28
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29 void LMConsistencyInfo::ComputeXheightConsistency(const BLOB_CHOICE *b, bool is_punc) {
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30 if (xht_decision == XH_INCONSISTENT) {
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31 return; // It isn't going to get any better.
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32 }
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33
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34 // Compute xheight consistency.
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35 bool parent_null = xht_sp < 0;
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36 int parent_sp = xht_sp;
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37 // Debug strings.
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38 if (b->yshift() > LMConsistencyInfo::kShiftThresh) {
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39 xht_sp = LMConsistencyInfo::kSUP;
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40 } else if (b->yshift() < -LMConsistencyInfo::kShiftThresh) {
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41 xht_sp = LMConsistencyInfo::kSUB;
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42 } else {
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43 xht_sp = LMConsistencyInfo::kNORM;
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44 }
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45 xht_count[xht_sp]++;
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46 if (is_punc) {
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47 xht_count_punc[xht_sp]++;
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48 }
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49 if (!parent_null) {
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50 xpos_entropy += abs(parent_sp - xht_sp);
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51 }
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52 // TODO(eger): Figure out a better way to account for small caps.
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53 // For the first character not y-shifted, we only care if it is too small.
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54 // Too large is common in drop caps and small caps.
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55 // int16_t small_xht = b->min_xheight();
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56 // if (parent_vse == nullptr && sp == LanguageModelConsistencyInfo::kNORM) {
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57 // small_xht = 0;
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58 // }
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59 IntersectRange(b->min_xheight(), b->max_xheight(), &(xht_lo[xht_sp]), &(xht_hi[xht_sp]));
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60
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61 // Compute xheight inconsistency kinds.
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62 if (parent_null) {
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63 if (xht_count[kNORM] == 1) {
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64 xht_decision = XH_GOOD;
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65 } else {
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66 xht_decision = XH_SUBNORMAL;
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67 }
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68 return;
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69 }
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70
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71 // When we intersect the ranges of xheights in pixels for all characters in
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72 // each position (subscript, normal, superscript),
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73 // How much range must be left? 0? [exactly one pixel height for xheight] 1?
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74 // TODO(eger): Extend this code to take a prior for the rest of the line.
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75 const int kMinIntersectedXHeightRange = 0;
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76 for (int i = 0; i < kNumPos; i++) {
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77 if (xht_lo[i] > xht_hi[i] - kMinIntersectedXHeightRange) {
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78 xht_decision = XH_INCONSISTENT;
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79 return;
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80 }
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81 }
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82
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83 // Reject as improbable anything where there's much punctuation in subscript
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84 // or superscript regions.
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85 if (xht_count_punc[kSUB] > xht_count[kSUB] * 0.4 ||
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86 xht_count_punc[kSUP] > xht_count[kSUP] * 0.4) {
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87 xht_decision = XH_INCONSISTENT;
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88 return;
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89 }
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90
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91 // Now check that the subscript and superscript aren't too small relative to
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92 // the mainline.
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93 auto mainline_xht = static_cast<double>(xht_lo[kNORM]);
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94 double kMinSizeRatio = 0.4;
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95 if (mainline_xht > 0.0 && (static_cast<double>(xht_hi[kSUB]) / mainline_xht < kMinSizeRatio ||
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96 static_cast<double>(xht_hi[kSUP]) / mainline_xht < kMinSizeRatio)) {
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97 xht_decision = XH_INCONSISTENT;
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98 return;
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99 }
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100 // TODO(eger): Check into inconsistency of super/subscript y offsets.
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101 if (xpos_entropy > kMaxEntropy) {
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102 xht_decision = XH_INCONSISTENT;
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103 return;
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104 }
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105 if (xht_count[kSUB] == 0 && xht_count[kSUP] == 0) {
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106 xht_decision = XH_GOOD;
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107 return;
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108 }
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109 xht_decision = XH_SUBNORMAL;
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110 }
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111
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112 } // namespace tesseract